eSIM for Mongolia

Mongolia is the hardest kind of country to describe honestly in coverage terms, because the answer changes completely depending on whether you are in a town or between them. Skytel and MobiCom carry our traffic here, both on 3G and 4G/LTE, and in Ulaanbaatar and the provincial centres that is a perfectly good connection. Out on the steppe, in the Gobi, or up in the Altai, you should plan your days on the assumption that you are offline and treat any signal as a bonus.

Getting online when you land

The airport sits a long way outside Ulaanbaatar and the transfer takes a while, so being connected before you get in a vehicle is worth the two minutes it costs. Install the profile at home over wifi, keep it switched off, and enable it once you are through the terminal.

Give the phone time to attach; it may test both networks before it settles on one. Set the plan as your data line and leave your usual number on the primary SIM for calls and codes, with roaming disabled on that line.

Do your setup, your map downloads and your message checking while you are still in the city. Ulaanbaatar is where everything works, and most Mongolia itineraries involve leaving it within a day or two for somewhere that will not let you fix anything.

The networks you'll be on

Skytel and MobiCom both run 3G and 4G/LTE. Your phone picks between them automatically as you move, and in the capital you will generally sit on 4G/LTE without thinking about it.

Away from the cities, the useful thing to know is that 3G travels further than 4G/LTE and often survives where the faster connection does not. When your phone drops from one to the other in a provincial town, that is the system working correctly rather than a fault. Messaging apps and simple map tiles will still load; video will not. Manual network selection is available if you want to try the other operator in a marginal spot, and it occasionally helps, but switch back to automatic before you drive on or your phone will hunt for a network that is no longer there.

Where coverage holds, and where it thins

Good: Ulaanbaatar in its entirety, Darkhan and Erdenet, and the provincial capitals. Most soum centres, the small district towns scattered across the country, have a tower, which means the pattern on a long drive is islands of signal separated by hours of nothing.

Effectively nothing: the open steppe between settlements, the Gobi away from the camps and towns, the mountain valleys of the Altai in the far west, the northern taiga around Khövsgöl outside the lakeside villages, and the long unpaved crossings that make up most of an overland itinerary. Terelj, close to the capital, is better than the true wilderness but still uneven once you leave the main valley road.

Ger camps vary enormously. Some have a satellite connection they will let guests use; many have nothing at all, and none of them should be treated as a guaranteed way to get online. If a plan depends on you being reachable on a given evening, confirm before you leave the last town rather than after.

What you'll actually use data for here

In the capital: ride-hailing and taxi apps, restaurant and hotel bookings, translation of Cyrillic signage, and buying train tickets or confirming domestic flights, which change more often than anyone would like.

On the road: mapping, and specifically offline mapping. There are stretches of this country where the route is a set of tracks across grass rather than a road, and your driver navigates by landmark. Having the terrain cached on your own phone is a sanity check rather than a replacement for a good guide.

Weather is the other genuinely important one, and it matters here in a way it does not in a gentler climate. Conditions in the Gobi and the mountains change fast, dirt tracks become impassable after rain, and river crossings that were fine in the morning are not fine in the afternoon. Load the forecast whenever you have signal, not when you need it.

Photo uploads are best saved for the city. In the countryside they will either fail or eat a disproportionate share of a slow connection while you are trying to send a message that matters.

Before you fly

Check that the handset is unlocked and eSIM capable, and install the plan before you leave home.

Download offline maps of every region on your route, not just the capital, and do it on a good connection before departure. Save your ger camp names, your driver's and guide's numbers, and your accommodation addresses as screenshots.

Cold is the practical enemy. Outside the warm months, temperatures here will drain a battery from full to dead far quicker than you expect, and a phone that dies is a phone with no maps. Carry a power bank, keep it and the phone in an inside pocket rather than an outer one, and charge whenever a vehicle or a camp generator gives you the chance.

Finally, set expectations with people at home before you go. Days without a reply are normal on a Mongolian itinerary and do not mean anything has gone wrong.